Jack is methodically applying plaster over the rough spots in the drywall, creating a nice, smooth finish. What's Jack doing?

Jack is engaged in the process of floating. This technique involves applying a layer of plaster or compound to fill in any imperfections or rough spots in the drywall. The goal is to create an even surface that is smooth and ready for further finishing or painting.

Floating typically happens before texturing or finishing, as it focuses specifically on enhancing the dry wall's surface quality. The term can be particularly associated with using a tool called a float, which helps in achieving that smooth surface by leveling out the plaster.

Other techniques mentioned, such as texturing, refer to applying a specific treatment to the wall to add visual interest or pattern, while skimming involves applying a thin layer over the entire surface to smooth it out. Finishing generally encompasses the final steps to prepare a surface for its intended use, which may include painting or adding texture.